In this paper we propose a high performance parallel strategy/technique to implement the fast direct solver based on hierarchical\nmatrices method. Our goal is to directly solve electromagnetic integral equations involving electric-large and geometrical-complex\ntargets, which are traditionally difficult to be solved by iterative methods. The parallel method of our direct solver features both\nOpenMP shared memory programming and MPl message passing for running on a computer cluster. With modifications to the\ncore direct-solving algorithm of hierarchical LUfactorization, the new fast solver is scalable for parallelized implementation despite\nof its sequential nature.The numerical experiments demonstrate the accuracy and efficiency of the proposed parallel direct solver\nfor analyzing electromagnetic scattering problems of complex 3D objects with nearly 4 million unknowns
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